Investigation of the optical response of photonic crystal nanocavities in ferroelectric oxide thin film

Pao Tai Lin, William A. Russin, Alexandra Joshi-Imre, Leonidas E. Ocola, B. W. Wessels

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The optical properties of BaTiO3 two dimensional photonic crystal (PhC) nanocavities were investigated. Two types of nanocavities consisting of dopants and vacancies with PhC periodicities ranging from 200 to 550 nm were evaluated. The images from laser scanning confocal microscopy show the optical scattering of the PhC cavities is highly wavelength dependent. An optical intensity reversal is observed when the wavelength of probe light shifts by 29 nm. Meanwhile, intensity contrast between the nanocavity and its adjacent PhCs is enhanced as the PhC periodicity becomes shorter than the probe wavelength. To determine the photonic band structures fluorescence from dye covered PhCs were imaged and analyzed. A strong enhancement of fluorescence is observed for the PhC with a period of 200 nm. Upon comparison to the 2D finite difference time domain calculations, the enhancement is attributed to strong light localization within the PhC nanocavity. As a result, the in-plane lightwave propagation is prohibited that results in an increase in the vertical light scattering.

Original languageEnglish (US)
Article number105402
JournalJournal of Optics (United Kingdom)
Volume17
Issue number10
DOIs
StatePublished - Sep 4 2015

Keywords

  • ferroelectric oxide thin films
  • nano patterning
  • photonic crystal cavities

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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